Killing Floor has just been updated to include the Twisted Christmas content!

Tripwire continues its long standing tradition of massive free content packs with the Twisted Christmas 2 Content Pack. The features an all new level, Ice Cave, as well as brand new Twisted Christmas music to get you in the holiday spirit. But wait - there's more! Santa is bringing even more gifts - the Winter Weapon Pack, with seven brand new weapons complete with new achievements, free to everyone who owns the game. Returning from last year's event we have Christmas themed specimens replacing all of the regular baddies, Santas Evil Lair, Christmas themed achievements and the chance for those who missed unlocking the special Baddest Santa character last year to grab him this time around.

Evil Santa and his favorite bringer of Fear, the Gingerfast would like to welcome you into the halls of his hidden Ice Cave. Don't forget to stock up on the new guns as you traverse the twisted and treacherous caverns.

New weapons for every perk to bring into the fight and achievements to gather as you slay Evil Santa's minions!

Also joining the hunt are the remaining Steam Punk characters! Commando, Demolitions, Support and DJ Scully are here to lend a hand.

The rather good co-op survival shooter, Killing Floor, will be free to play on Steam from this Thursday through Sunday, giving everyone a chance to try out the new goodies added by this year's Twisted Christmas event. I hope you enjoy nightmares about six foot tall gingerbread men with a taste for human flesh, because Killing Floor will throw hordes of them at your face on the new Ice Cave map.

The event will also give you the chance to shoot Christmas in the face with new weapons, including a vintage revolver, automatic shotgun, a huge sword and a powerful Husk cannon. Find out more on the official Twisted Christmas page (warning: contains large image of nightmarish gingerbread man). The event starts today, and will run until January 4.

The Tripwire guys do like a bit of seasonal celebration in their Killing Floor. This year they’re gifting us with “the Winter Weapon Pack, with seven brand new weapons complete with new achievements, free to everyone who owns the game” but there’s also an entirely new level, the Ice Cave, which you can check out for free, even if you do not own the game, thanks the free weekend on the Steam from Thursday 8th to Sunday 11th December. There’s other exciting new DLC, too, such as the Steampunk pack, which lets you dress like one of those digital distribution punks, I think. Hmm.

As some of our most ardent fans have guessed, there are some new toys coming for Killing Floor - a whole bunch of new weapons, for a start! On top of that, add in a new map (Ice Cave), new achievements, the return of the Christmas Zeds and a full Twisted Christmas 2. Bring back the old Christmas achievements so those of you who missed out can get Baddest Santa. And a new DLC character pack (Steampunk 2) to round it all off with.

When the name of your game is Killing Floor and the premise is "kill everything that isn't you," a certain amount of holiday cheer is expected. Developer Tripwire Interactive has announced the return of its Twisted Christmas holiday event, which will add a new level, music, weapons, and achievements to the game for a limited time.

The content is free to all owners of the game will be available from December 7 through January 4. Killing Floor will also be free to play via Steam this weekend, beginning December 8 through December 11.

But, that's not all: "Returning from last year's event we have Christmas themed specimens replacing all of the regular baddies, Santaâs Evil Lair, Christmas themed achievements and the chance for those who missed unlocking the special Baddest Santa character last year to grab him this time around."

This year's event adds the level Ice Cave as well as seven brand new weapons. Another character DLC character pack is also in the works, entitled Steampunk 2, helping users "complete the set" of Steampunk-style characters introduced in previous DLC.

For more information on the content, check out the game's official blog.

Killing Floor is available on Steam, Direct2Drive, and other digital distribution services.